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  项目中串并行执行命令的方式总结
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  <time datetime="2022-01-18T09:02:52.000Z" itemprop="datePublished">2022-01-18</time>
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  <p>开发 web 项目时，为了方便开发体验，我们一般会搭建脚手架，在项目根目录的 <code>package.json</code> 文件中通过配置 <code>sripts</code> 命令，帮助项目快速运行。今天总结下如何更方便快捷的运行多个命令。</p>
<p>多个命令一起运行时，根据命令之间是否存在依赖关系分为俩类：</p>
<ol>
<li><p>串行命令（顺序执行）</p>
<p> <strong>顺序执行命令即 前面一个命令未执行结束，则后一个任务不会执行。</strong></p>
</li>
<li><p>并行命令</p>
</li>
</ol>
<p>根据命令之间的依赖关系，npm 提供了多个第三方插件帮助执行多个命令，但我们也可不借助第三方插件实现命令的执行。</p>
<h2 id="不借助插件"><a href="#不借助插件" class="headerlink" title="不借助插件"></a>不借助插件</h2><p>可按照表格中的符号将多个命令进行组合：</p>
<table>
<thead>
<tr>
<th align="center">符号</th>
<th align="center">含义</th>
</tr>
</thead>
<tbody><tr>
<td align="center">&amp;</td>
<td align="center">并行执行多条命令</td>
</tr>
<tr>
<td align="center">&amp;&amp;</td>
<td align="center">顺序执行多条命令，当前一个命令<code>出错</code>时，则不会运行后续的命令</td>
</tr>
<tr>
<td align="center">||</td>
<td align="center">顺序执行多条命令，当前一个命令<code>正确</code>时，则不会运行后续的命令</td>
</tr>
</tbody></table>
<p>示例1：</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">&#123;</span><br><span class="line">  <span class="attr">&quot;scripts&quot;</span>: &#123;</span><br><span class="line">    <span class="attr">&quot;dev:serials&quot;</span>: <span class="string">&quot;webpack --config webpack.client.js &amp;&amp; webpack --config webpack.server.js &amp;&amp; nodemon build/bundle.js&quot;</span>,</span><br><span class="line">    <span class="attr">&quot;dev:parallel&quot;</span>: <span class="string">&quot;webpack --config webpack.client.js &amp; webpack --config webpack.server.js &amp; nodemon build/bundle.js&quot;</span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>示例2：</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">&#123;</span><br><span class="line">  <span class="attr">&quot;scripts&quot;</span>: &#123;</span><br><span class="line">    <span class="attr">&quot;dev:build-server&quot;</span>: <span class="string">&quot;webpack --config webpack.server.js&quot;</span>,</span><br><span class="line">    <span class="attr">&quot;dev:server-run&quot;</span>: <span class="string">&quot;nodemon build/bundle.js&quot;</span>,</span><br><span class="line">    <span class="attr">&quot;dev&quot;</span>: <span class="string">&quot;webpack --config webpack.client.js &amp;&amp; npm run dev:build-server &amp;&amp; npm run dev:server-run&quot;</span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="借助-npm-run-all-插件"><a href="#借助-npm-run-all-插件" class="headerlink" title="借助 npm-run-all 插件"></a>借助 <code>npm-run-all</code> 插件</h2><ol>
<li><p>并行多个命令</p>
<ol>
<li>完整写法：<code>npm-run-all --paraller dev:*</code></li>
<li>简化版1：<code>npm-run-all -p dev:*</code> </li>
<li>简化版2：<code>run-p dev:*</code>  </li>
</ol>
</li>
<li><p>串行多个命令</p>
<ol>
<li>完整写法：<code>npm-run-all --serial dev:*</code></li>
<li>简化版1： <code>npm-run-all -s dev:*</code></li>
<li>简化版2： <code>run-s dev:*</code></li>
</ol>
</li>
</ol>
<p>示例：</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">&quot;scripts&quot;: &#123;</span><br><span class="line">  &quot;init&quot;: &quot;run-p dev:build-*&quot;,</span><br><span class="line">  &quot;dev:build-client&quot;: &quot;webpack --config webpack.client.js&quot;,</span><br><span class="line">  &quot;dev:build-server&quot;: &quot;webpack --config webpack.server.js&quot;,</span><br><span class="line">  &quot;init:watch&quot;: &quot;run-p dev:watch-build-*&quot;,</span><br><span class="line">  &quot;dev:watch-build-client&quot;: &quot;webpack --config webpack.client.js --watch&quot;,</span><br><span class="line">  &quot;dev:watch-build-server&quot;: &quot;webpack --config webpack.server.js --watch&quot;,</span><br><span class="line">  &quot;dev:watch&quot;: &quot;run-p dev:server-run init:watch&quot;,</span><br><span class="line">  &quot;dev&quot;: &quot;run-s init dev:watch&quot;,</span><br><span class="line">  &quot;dev:server-run&quot;: &quot;nodemon build/bundle.js&quot;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure> 
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